CN110930625A - Optical fiber overheat or fire alarm detector - Google Patents
Optical fiber overheat or fire alarm detector Download PDFInfo
- Publication number
- CN110930625A CN110930625A CN201911074764.4A CN201911074764A CN110930625A CN 110930625 A CN110930625 A CN 110930625A CN 201911074764 A CN201911074764 A CN 201911074764A CN 110930625 A CN110930625 A CN 110930625A
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- China
- Prior art keywords
- fiber
- metal tube
- overheat
- capillary metal
- fiber optic
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Detection Mechanisms (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
The invention belongs to the technical field of overheat or fire alarm detection, and relates to an optical fiber overheat or fire alarm detector, which comprises: the fiber bragg grating sensor comprises a fiber connector (1), a fiber bragg grating array (2) and a capillary metal tube (3); according to the optical fiber overheating or fire alarm detector, the problems of temperature and stress cross sensitivity are solved through the high-density and large-capacity optical fiber grating array, the capillary metal tube armor and the optical fiber grating array single-end fixing structure, and the characteristics of simple structure and small size are achieved, so that overheating or fire alarm temperature detection and early warning at the monitoring position of an airplane are realized; according to the technical scheme, the anti-oxidation and high-temperature resistance are realized and the response time is prolonged by the sealing structure and the filling of the inert gas.
Description
Technical Field
The invention belongs to the technical field of overheat or fire alarm detection, and relates to an optical fiber overheat or fire alarm detector.
Background
The conventional aircraft overheating/fire alarm detectors are usually in eutectic salt and pneumatic line type, the detectors output single alarm signals, cannot reflect and monitor temperature in real time, cannot realize overheating/fire alarm early warning, and cannot realize early warning and high-precision positioning of overheating/fire alarm positions because the detectors cannot be positioned or are low in positioning precision, only can give an alarm after a fault.
Therefore, the problem that the conventional aircraft overheating/fire alarm detector cannot realize early warning and high-precision positioning of an overheating/fire alarm position needs to be solved urgently.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problem, the invention provides an optical fiber overheating/fire alarm detector.
The technical scheme of the invention is as follows: an optical fiber overheat or fire detector comprising: the optical fiber connector comprises an optical fiber connector 1, an optical fiber grating array 2 and a capillary metal tube 3; the optical fiber connector 1 is fixedly connected with the capillary metal tube 3; the capillary metal tube 3 is of a tubular structure, the inner cavity of the capillary metal tube is a capillary metal tube cavity 4, the fiber grating array 2 is arranged in the capillary metal tube cavity 4, one end of the capillary metal tube 3 is fixed with the shell of the optical fiber connector 1, the fiber grating array 2 is inserted into the insertion core of the optical fiber connector 1 and sealed, and the other end of the capillary metal tube 3 is sealed after the capillary metal tube cavity 4 is filled with inert gas 6.
The fiber grating array 2 is formed by etching dozens to hundreds of gratings 5 on one optical fiber, and the space between the gratings 5 can be as short as 10 mm.
And a gap is reserved at the sealed end of the capillary metal tube 3 of the fiber grating array 2.
The optical fiber connector 1 and the capillary metal tube 3 are welded through laser welding.
The material of the capillary metal tube 3 is a good conductor, and can be stainless steel, and the type of the stainless steel is 304 or 316L.
Before filling the cavity 4 of the capillary metal tube with inert gas, vacuum pumping is carried out.
The optical fiber overheat or fire alarm detector, the optical fiber grating demodulator 7 and the transmission optical fiber 8 form an overheat or fire alarm detection system.
The fiber connector 1 connects the fiber grating array 2 with the optical signal input end of the fiber grating demodulator 7.
The inserting core inserting process of the fiber bragg grating array 2 and the optical fiber connector 1 comprises the following steps: one end of the fiber grating array 2 is stripped by the Miller clamp to remove the coating layer, penetrates through the inserting core of the fiber connector 1 and is fixed and sealed by fiber cement.
The end face of the ferrule needs to be ground and detected, so that the effectiveness of optical signal transmission is guaranteed.
The invention has the beneficial effects that: the optical fiber overheating or fire alarm detector provided by the invention solves the problem of cross sensitivity of temperature and stress through the characteristics of a high-density and large-capacity optical fiber grating array, capillary metal tube armor and an optical fiber grating array single-end fixing structure, and is simple in structure and small in size, and realizes overheating or fire alarm temperature detection and early warning at the monitoring position of an airplane. According to the technical scheme, the anti-oxidation and high-temperature resistance are realized and the response time is prolonged by the sealing structure and the filling of the inert gas.
Drawings
FIG. 1 is a schematic diagram of a fiber optic overheat or fire detector according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fiber grating array according to an embodiment of the present invention;
FIG. 3 is a schematic view of the cavity of the capillary metal tube filled with inert gas according to the embodiment of the present invention
FIG. 4 is a schematic diagram of an optical fiber overheat/fire alarm detection system according to an embodiment of the present invention
Wherein: 1. an optical fiber connector; 2. a fiber grating array; 3. a capillary metal tube; 4. a capillary metal tube cavity; 5. a grating; 6. an inert gas; 7. a fiber grating demodulator; 8. transmission optical fiber
Detailed Description
Fig. 1 is a schematic structural diagram of an optical fiber overheating or fire detector according to an embodiment of the present invention, which includes an optical fiber connector 1, an optical fiber grating array 2, and a capillary metal tube 3; the optical fiber connector 1 is fixedly connected with the capillary metal tube 3; the capillary metal tube 3 is of a tubular structure, the inner cavity of the capillary metal tube is provided with a capillary metal tube cavity 4, the fiber grating array 2 is arranged in the capillary metal tube cavity 4, one end of the capillary metal tube 3 is fixed with the shell of the optical fiber connector 1, the fiber grating array 2 is inserted into the insertion core of the optical fiber connector 1 and sealed, and the other end of the capillary metal tube 3 is sealed after the capillary metal tube cavity 4 is filled with inert gas 6.
The optical fiber connector 1 is used for connecting one end of the fiber grating array 2 with the optical signal input end of the fiber grating demodulator 7. The fiber grating array 2 is composed of a plurality of gratings 5 in series connection, referring to fig. 2, the gratings 5 sense temperature signals corresponding to overheating or fire detection positions of the aircraft, and the effective refractive index of the fiber core of each grating is 2neffThe grid period Λ of the grating varies.
The fiber grating demodulator 7 transmits optical signals to the fiber grating array 2 through the fiber connector 1, and when the temperature signal corresponding to the overheat or fire detection position of the aircraft changes, the wavelength lambda of the grating corresponding to the position changesBThe fiber grating demodulator 7 demodulates the grating wavelength lambdaBAnd demodulating a temperature signal.
λB＝2neffΛ
In the formula ofB，2neffAnd Λ represent the grating wavelength, the fiber core effective index, and the grating period of the fiber grating, respectively.
The fiber grating array 2 is formed by etching dozens to hundreds of gratings 5 on one optical fiber, the distance between the gratings 5 can be as short as 10mm, a certain gap is reserved at the sealing end of the capillary metal tube 3 of the fiber grating array 2, when the capillary metal tube is influenced by external stress, the fiber grating array 2 can freely stretch and retract, and the problem of cross sensitivity of temperature and stress is effectively solved.
The optical fiber connector 1 and the capillary metal tube 3 are welded through laser welding, so that reliable connection is guaranteed, and meanwhile, the sealing effect is achieved; the capillary metal tube 3 is made of a good conductor, can be made of stainless steel, and has an anti-corrosion effect. The stainless steel is 304 or 316L. Can guarantee that grating 5 perception aircraft is overheated or fire alarm temperature signal simultaneously, can also guarantee fiber grating array 2's mechanical strength, make fiber grating array 2 satisfy aircraft special environment operation requirement.
Referring to fig. 3, before filling the cavity 4 of the capillary metal tube with inert gas, vacuum pumping is performed. Injecting inert gas 6 into the capillary metal tube cavity 4 until the pressure in the capillary metal tube cavity 4 meets the requirement; the oxidation resistance of the fiber grating array is improved, and the temperature sensing rate of the grating 5 is improved.
Referring to fig. 4, the optical fiber overheat or fire detector, the fiber grating demodulator 7 and the transmission optical fiber 8 form an overheat or fire detection system. The optical signal transmitted by the fiber grating demodulator 7 enters the fiber overheating or fire detector through the transmission fiber 8, the fiber overheating/fire detector senses the temperature of the aircraft in real time, changes the optical signal caused by the temperature signal and returns the optical signal to the fiber grating demodulator 7 through the transmission fiber, and the fiber grating demodulator 7 demodulates the temperature and the position, so that the aircraft overheating/fire alarm early warning monitoring is realized.
The fiber connector 1 connects the fiber grating array 2 with the optical signal input end of the fiber grating demodulator 7.
The inserting core inserting process of the fiber bragg grating array 2 and the optical fiber connector 1 comprises the following steps: one end of the fiber grating array 2 is stripped by the Miller clamp to remove the coating layer, penetrates through the inserting core of the fiber connector 1 and is fixed and sealed by fiber cement. The end face of the ferrule needs to be ground and detected, so that the effectiveness of optical signal transmission is guaranteed.
Claims (10)
1. An optical fiber overheat or fire detector comprising: the fiber bragg grating sensor comprises a fiber connector (1), a fiber bragg grating array (2) and a capillary metal tube (3); the optical fiber connector (1) is fixedly connected with the capillary metal tube (3); the capillary metal tube (3) is of a tubular structure, the inner cavity of the capillary metal tube is a capillary metal tube cavity (4), the fiber grating array (2) is arranged in the capillary metal tube cavity (4), one end of the capillary metal tube (3) is fixed with the shell of the optical fiber connector (1), the fiber grating array (2) is inserted into the insertion core of the optical fiber connector (1) and sealed, and the other end of the capillary metal tube (3) is sealed after the capillary metal tube cavity (4) is filled with inert gas (6).
2. The fiber optic overheat or fire detector according to claim 1, wherein the fiber optic grating array (2) is formed by etching several tens to several hundreds of gratings (5) on one fiber, and the spacing between the gratings (5) can be as short as 10 mm.
3. The fiber optic overheat or fire detector according to claim 1 wherein the fiber grating array (2) leaves a void at the sealed end of the capillary metal tube (3).
4. The fiber optic overheat or fire detector according to claim 1, wherein the fiber optic connector (1) and the capillary metal tube (3) are welded by laser welding.
5. The fiber optic overheat or fire detector according to claim 1, wherein the material of the capillary metal tube (3) is a good conductor, which may be stainless steel, the type of stainless steel being 304 or 316L.
6. The fiber optic overheat or fire detector according to claim 1 wherein the capillary metal tube cavity (4) is evacuated before being filled with the inert gas (6).
7. The fiber optic overheat or fire detector according to claim 1, wherein the fiber optic overheat or fire detector, the fiber optic grating demodulator (7) and the transmission fiber (8) constitute an overheat or fire detection system.
8. The fiber optic overheat or fire detector according to claim 7 wherein the fiber optic connector (1) connects the fiber grating array (2) to the fiber grating demodulator (7) optical signal input.
9. The fiber optic overheat or fire detector according to claim 1, wherein the process of inserting the fiber bragg grating array (2) into the ferrule of the fiber optic connector (1) comprises: one end of the fiber grating array (2) is stripped by the Miller clamp to remove the coating layer, penetrates through the insertion core of the fiber connector (1), and is fixed and sealed by fiber cement.
10. The fiber optic overheat or fire detector of claim 9 wherein said ferrule end face is ground and inspected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911074764.4A CN110930625A (en) | 2019-11-05 | 2019-11-05 | Optical fiber overheat or fire alarm detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911074764.4A CN110930625A (en) | 2019-11-05 | 2019-11-05 | Optical fiber overheat or fire alarm detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110930625A true CN110930625A (en) | 2020-03-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911074764.4A Pending CN110930625A (en) | 2019-11-05 | 2019-11-05 | Optical fiber overheat or fire alarm detector |
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| Country | Link |
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| CN (1) | CN110930625A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112419651A (en) * | 2020-11-17 | 2021-02-26 | 天津航空机电有限公司 | Distributed optical fiber fire alarm detector in aviation-resistant environment |
| CN114001842A (en) * | 2021-10-22 | 2022-02-01 | 天津航空机电有限公司 | High-temperature optical fiber temperature sensor |
| CN114046898A (en) * | 2021-11-05 | 2022-02-15 | 天津航空机电有限公司 | Aircraft bleed air leakage overheat detector, system and aircraft |
-
2019
- 2019-11-05 CN CN201911074764.4A patent/CN110930625A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112419651A (en) * | 2020-11-17 | 2021-02-26 | 天津航空机电有限公司 | Distributed optical fiber fire alarm detector in aviation-resistant environment |
| CN114001842A (en) * | 2021-10-22 | 2022-02-01 | 天津航空机电有限公司 | High-temperature optical fiber temperature sensor |
| CN114046898A (en) * | 2021-11-05 | 2022-02-15 | 天津航空机电有限公司 | Aircraft bleed air leakage overheat detector, system and aircraft |
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Application publication date: 20200327 |